Door for fuel-openings of furnaces.



I M. A. MALLOY. DOOR FOR FUEL OPENINGS OF FURNACES. APPLICATION FILED AUG. 20, 1910.

1,087,885, Patented Feb. 17, 1914.

IHHH I WITNESSES:

WWW. Jfiw ATTORNEY MARY A. MALILOFZ', OF PORTLAND, OREGON, ASSIGNOR, BY MESNE ASSIGNMENTS, '10 GRACE HUDSON.

DOOR FOR FUEL-OPENINGS 0F FURNACES.

Specification of Letters Patent.

Patented licb. it, Mi ts-t.

To all whom, it may concern:

is it known that I, MARY A. lvlALLoY, a citizen of the United States, and a resident of Portland, county of Multnomah, State of Oregon, have invented a new and useful Int provement in Doors for Fuel-Openings of Furnaces, of which the following is a specification.

My present invention relates to furnaces requiring an air-zmd-gas-tight combustion chamber, as set forth in my pending application for Letters Patent for an improvement in furnaces, tiled July 21, 1910, Serial No. 573,109, and to which reference is here by had.

The object of this invention is to provide the wall of the casing of said combustion chamber with a fuel opening and a door therefor, which is convenient to make and which when. closed provides an etficient airand-gas-tight closure.

I attain my object in the devices illustrated in the accompanying drawing constitiiiting a part hereof, and in which:

Figure l is an exterior view of a portion of the wall of the combustion chamber, provided with an opening through which to introduce fuel, and such fuel-opening being closed by a door embodying my invention; F 2 is a horizontal plan section, approximately taken on a line pointed by the arrow, on, in Fig. l; 3 is a vertical section approximately taken on a line AA of Fig. 1.

a represents a portion of the casing of the combustion chamber above the grate. It is provided with an opening, 6, through which to introduce .iuel as required. The rim of such fuel-opening is provided with a ground exterior face, so as to have a substantially i air-and-gas-tight fit, with the rim of the door, 0, which rim is also provided with a ground face. 011 the interior of wall-section, a, are provided hinge lugs, cl, (Z, between which is hinged an arm, 6, curved at f, and so formed that, when the door is latched, the main portion of said arm will be located in and extend across the full open ing, as shown in Fig. 2. Said arm is provided at its free end with an inwardly bent part, g, constituting a latch, adapted to be engaged with a lug, h, on the interior of the wall, a. At the center, 2', the arm, 6, is enlarged and provided with a threaded socket, in which rotates the stud-screw, j, integrally formed on the interior of the door, 0, as

more clearly shown in Figs. 2 and 3. fhe stud-screw, j, may be cast hollow to reduce weight of metal, as shown in Fig. 3.

On the exterior oi the door a is a knob Z. To open the door the operator grasps the knob Z and. rotates the door, which movement through the medium of the screw removes said door from contact with the easing (4. Then by slightly elevating the door the outer end of the arm 0, is raised out of engagement with the lug it, whereupon said door may be swung open. In closing the door, the latching g on the outer extremity of the arm, a, is in the first instance latched with the lug, It, and then. the door, 0, is given a half turn to the left, by its knob, so as to seat the rim of the door tightly against the rim of the fuel-opening, 7). I

The abutting faces of the rim of the door, and the fuel-opening, must be adapted to have an air-a11d-gas-tigl1t contact when the door is closed. This ettect is preferably accomplished by providing one of the abutting faces of said parts, as for example the rim or the opening, Z), with an annular cavity, 10, V-shaped in cross section, and providing the other part, for example the rim of the door, 0, with a corresponding annular riblike protuberance, 2 so as to cause said abutting faces to interlock with each other when the door is closed.

I claim:

1. The combination with a casing having a door opening a bearing on the inside of the casing adjacent the opening, a bar having one end bent to form a latch in its opposite end extended. and re-bent to form a neck provided with an opening a pivot in the latter opening and the bearing to support said bar, the central. portion of said bar having a threaded opening, a lug on the inside of the casing to cooperate with the latch on the bar, a door bearing against the outside of the casing adjacent the opening therein a threaded stem extending from the door and engaging the threaded opening in the bar, and a knob on the door whereby upon turning the door it will be removed from the easing and upon lifting the door and bar the latch will be disengaged from the lug and the opening in the casing may be uncovered.

2. The combination of a casing formed with an opening, a bearing on the inside of the casing adjacent the opening, a lug on the inside of the casing a bar pivoted in the When said door and bar are raised to disenl0 gage the bent end from the lug the door may be swung open to uncover the openmg 1n the bearing, said bar having one end bent to engage the lug, the bar having a threaded openlng, a door engaging the outslde of the casing and covering the opening in said cascasing.

n hr 1e st m 130' cti a torn th 1 w t F P 16 I MARY A. MALLOY. door and engaglng the threaded opening: 1n

the bar, whereby WASH the door is turned in \V1tnesses:

G120. A. MORGAN, W. A. ANDREWS.

ene direction the threads will cause the door to move away from the casing and whereby Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. G. 

